The correct answers are
A) People tend to move where their family moves.
D) People are more likely to move if they have no familial ties.
The climate always changes, yes. It’s natural. However, humans have sped it up via things like carbon emissions. One simple example is when you eat a banana and put it in the trash can, when it gets to the landfill it is so trapped it produces methane gas- as do cows.